[Personal View] Zoonotic infections due to avian Chlamydia abortus: what are we missing?

Chlamydia abortus is an obligate intracellular bacterium primarily affecting ruminants and causing reproductive failures in sheep and goats. As a recognised zoonotic pathogen, C abortus can cause obstetric and respiratory infections in humans, with severe consequences in pregnant women and immunocompromised individuals. Previous studies have identified novel C abortus strains in avian species, closely related to the zoonotic Chlamydia psittaci, with some strains associated with cases of human pneumonia.